Kamutula,
The larger the pool, the better we might be able to have an accurate indication of the cost of 1GB of mobile data.

Please recall that these days there are likely to be very few standalone 1GB plans. Some plans would be less than 1GB, some more than 1 GB, whilst others are bundled packages. Also, there will also be a distinction between prepaid and postpaid plans, and the customers to whom they are targeted.

Further, the pricing rationale for all of these permutations and combinations is unlikely to be consistent, and so one is hoping that determining the median will give one a somewhat ‘balanced view’ of what 1GB of mobile data ought to cost.